In 1985 he left academic life and worked with the Greater London Council and Inner London Education Authority until they were abolished by the Thatcher government then later with the London Borough of Islington and for the local government unit of the Labour party. In 1997 he started to work as a consultant on issues of modernisation. In 1999 he started to work for the Office for Public Management and published "Shakespeare on Management: Leadership Lessons for Today's Managers".[4]
In 2001 he was appointed as a special advisor to Secretary of State for HealthAlan Milburn. He served as special advisor to Milburn's successor, Dr John Reid.[1] Corrigan is credited as the man behind the Labour government's policy on foundation hospitals and has written widely about the principle of choice. In 2006, Corrigan returned to the government as a policy adviser to the prime minister. In 2007 he announced that he was going to work for the National Health Service in London. He was the Director of Strategy and Commissioning of the NHS London strategic health authority from June 2007 to March 2009.[1]
Corrigan has advocated privatisation of NHS hospitals that face financial difficulties.[5]
He became a non-executive director of the Care Quality Commission in July 2013.[1]
Corrigan was appointed by Health Secretary Wes Streeting to the Department of Health and Social Care in July 2024 to help develop an NHS reform package for the newly elected Labour Government.[7]